基于耳石Sr同位素反演鄱阳湖刀鲚出生起源及早期发育阶段生境履历的初步研究  

Preliminary study for using otolith ^(87)Sr/^(86)Sr to track the natal origin and reconstructing the early life history habitats of Coilia nasus from the Poyang Lake

作　　者：轩中亚 杨彦平[1] 华忠[1] 马凤娇 王银平[1] 刘凯[1,2] XUAN Zhongya;YANG Yanping;HUA Zhong;MA Fengjiao;WANG Yinping;LIU Kai(Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization,Ministry of Agriculture and Rural Affairs,Freshwater Fisheries Research Center,Chinese Academy of Fishery Sciences,Wuxi 214081,China;Wuxi Fisheries College,Nanjing Agricultural University,Wuxi 214081,China)

机构地区：[1]中国水产科学研究院淡水渔业研究中心,农业农村部淡水渔业和种质资源利用重点实验室,江苏无锡214081 [2]南京农业大学,无锡渔业学院,江苏无锡214081

出　　处：《中国水产科学》2024年第10期1218-1229,共12页Journal of Fishery Sciences of China

基　　金：江西省重点水域长颌鲚重要栖息地调查项目(NY2022-C0901);鄱阳湖水生生物资源监测项目。

摘　　要：目前通过耳石Sr/Ca比值可以确定刀鲚(Coilia nasus)经历淡水、河口及海洋的洄游生活史,然而在追溯刀鲚个体的出生起源及早期发育阶段淡水生境履历转变方面仍存在困难。为探索新的追溯鄱阳湖中刀鲚的孵化场来源及早期生活史中不同淡水栖息地转变的方法,利用激光剥蚀连接多接收电感耦合等离子体质谱(LA-MC-ICP-MS)技术,分析了2023年7—8月采自鄱阳湖都昌水域的10尾刀鲚(Coilianasus)成鱼个体以及3尾短颌鲚(Coilia brachygnathus)成鱼矢耳石的锶同位素(^(87)Sr/^(86)Sr)组成特征。从耳石核心到边缘的^(87)Sr/^(86)Sr线分析结果显示,3尾短颌鲚的耳石^(87)Sr/^(86)Sr比值变化不大,在0.71448附近波动,反映了其鄱阳湖定居生活史;9尾刀鲚核心附近^(87)Sr/^(86)Sr比值接近0.71448,显示其孵化自鄱阳湖,并“回归”至出生栖息地鄱阳湖,其中4尾个体在仔稚鱼阶段迁出鄱阳湖,5尾个体在幼鱼阶段迁出;1尾刀鲚耳石核心附近^(87)Sr/^(86)Sr比值平均值为0.71078,显示为长江干流出生,在上溯洄游的过程中没有回到出生栖息地,而是进入了非出生栖息地鄱阳湖。这些结果反映了耳石^(87)Sr/^(86)Sr比值作为鄱阳湖刀鲚产卵场地理标志和区分鄱阳湖与长江干流生活史方面的客观性、准确性和稳定性,初步显示了其作为刀鲚出生起源和生境自然标签的潜力,也初步表明了鄱阳湖刀鲚早期个体迁出鄱阳湖时机的多样性。Coilia nasus,a historically significant fish species in the Yangtze River,has experienced a significant decline because of overfishing and habitat degradation.As an anadromous fish,C.nasus traverses different habitats over large geographic areas,making effective conservation difficult.Tracing their natal origin and lifelong habitat useage at the individual and population levels will enhance our ability to protect critical habitats of this anadromous fish.The migratory life history of C.nasus across freshwater,estuarine,and marine environments can be determined by analyzing otolith Sr/Ca ratios.However,difficulties remain in tracking their natal origins and identifying transitions between freshwater habitats during the early stages of their development.The use of otolith ^(87)Sr/^(86)Sr isotopic ratios offers a robust approach for tracing the natal origins and migration patterns of C.nasus.The Sr isotope(^(87)Sr/^(86)Sr)composition of the otoliths was analyzed using laser ablation multi-collector inductively coupled plasma mass spectrometry(LA-MC-ICP-MS)to confirm the hatching grounds and life histories of C.nasus in the Poyang Lake.In July and August 2023,a total of ten adult C.nasus and three adult C.brachygnathus were collected from the Duchang area of the Poyang Lake,Jiangxi Province,China.The otolith ^(87)Sr/^(86)Sr profiles from the core to the edge displayed minor fluctuations of approximately 0.71448,indicating that the three C.brachygnathus individuals reside in the Poyang Lake.The ^(87)Sr/^(86)Sr ratio of the otolith core region of nine C.nasus was close to 0.71448,indicating that they hatched in the Poyang Lake and subsequently returned to the lake(because they were caught in the Poyang Lake).Among these individuals,four migrated out of the Poyang Lake during their larval stage and five migrated during their juvenile stage.One individual exhibited an average ^(87)Sr/^(86)Sr ratio of 0.71078 in its first segment,suggesting that it was born in the main channel of the Yangtze River and then strayed into Po

关 键 词：刀鲚 耳石 SR同位素 ^(87)Sr/^(86)Sr 鄱阳湖 

分 类 号：S931[农业科学—渔业资源]